I went for 3 1/2 yrs with progressively worsening lower back pain, leg pain, severe spasms in back, legs, feet, pins & needles in my feet and legs(then progressed to my neck, shoulders, face). I was diagnosed with 2 herniated discs, DDD, spinal OA, and severe stenosis in L3 to L5. At first I had to do physical therapy to see if that would help, as per insurance. When I had my consulation, they tested all my reflexes and I had absolutely no reflex in my right knee and lessened reflex in my left knee. He checked it several times & also had me clenching my fingers and trying to pull them apart while he was checking & still got the same results. He said that it was consistent with impinged nerves in the L4 region, so my discs & stenosis were causing absence of the knee reflex. I also had epidural injections done by a PM..he also tested my reflexes and found the same thing & told me the same thing. Finally I was at the point that surgery was my only option left...and the surgeon got no reflexes either. It was explained to me that this reflex is controlled by electrical impulses along the spinal nerves and does not involve the brain. So usually loss of this reflex can be caused by some type of injury to the spinal cord or nerves in there.
Do you have any trouble walking any distances? Or do you find any relief from your leg pain while bending forward? Did you have an MRI done at all?
I can only say what the cause of my case was....but it could be possible you might have a herniated disc or other issue in your spine.